All Java Arrays methods

Here’s a complete Java array methods list with short descriptions — covering both the built-in property and all important methods from the java.util.Arrays utility class.

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1️⃣ Core Array Property

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2️⃣ java.util.Arrays Methods

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If you want, I can prepare the same style table for Java String methods so both arrays and strings are in your interview-ready cheat sheet format. That way, you’ll have methods + descriptions for both.

You said:

with all exmpale

ChatGPT said:

Alright — I’ll give you a full Java Array Methods Cheat Sheet with all important methods + descriptions + working examples in one file.
This will include core array features and all major java.util.Arrays methods.

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javaCopyEditimport java.util.Arrays;
import java.util.stream.IntStream;

public class AllArrayMethodsExample {
    public static void main(String[] args) {

        // 1️⃣ length (property)
        int[] numbers = {5, 3, 9, 1, 4};
        System.out.println("length: " + numbers.length); // 5

        // 2️⃣ sort()
        Arrays.sort(numbers);
        System.out.println("sort(): " + Arrays.toString(numbers)); // [1, 3, 4, 5, 9]

        // 3️⃣ sort(array, fromIndex, toIndex)
        int[] partialSort = {10, 3, 8, 1, 7};
        Arrays.sort(partialSort, 1, 4);
        System.out.println("sort(from,to): " + Arrays.toString(partialSort)); // [10, 1, 3, 8, 7]

        // 4️⃣ parallelSort()
        int[] parallelArr = {9, 2, 7, 1, 6};
        Arrays.parallelSort(parallelArr);
        System.out.println("parallelSort(): " + Arrays.toString(parallelArr)); // [1, 2, 6, 7, 9]

        // 5️⃣ binarySearch()
        int index = Arrays.binarySearch(numbers, 4);
        System.out.println("binarySearch(4): " + index); // 2

        // 6️⃣ binarySearch(from,to,key)
        int indexRange = Arrays.binarySearch(numbers, 1, 4, 5);
        System.out.println("binarySearch(from,to,5): " + indexRange); // 3

        // 7️⃣ copyOf()
        int[] copy = Arrays.copyOf(numbers, numbers.length);
        System.out.println("copyOf(): " + Arrays.toString(copy));

        // 8️⃣ copyOfRange()
        int[] rangeCopy = Arrays.copyOfRange(numbers, 1, 4);
        System.out.println("copyOfRange(1,4): " + Arrays.toString(rangeCopy)); // [3, 4, 5]

        // 9️⃣ fill()
        int[] filled = new int[5];
        Arrays.fill(filled, 7);
        System.out.println("fill(): " + Arrays.toString(filled)); // [7, 7, 7, 7, 7]

        // 🔟 fill(from,to,value)
        Arrays.fill(filled, 1, 4, 99);
        System.out.println("fill(from,to,value): " + Arrays.toString(filled)); // [7, 99, 99, 99, 7]

        // 1️⃣1️⃣ equals()
        System.out.println("equals(): " + Arrays.equals(numbers, copy)); // true

        // 1️⃣2️⃣ deepEquals() for multi-dimensional arrays
        int[][] arr2D1 = {{1, 2}, {3, 4}};
        int[][] arr2D2 = {{1, 2}, {3, 4}};
        System.out.println("deepEquals(): " + Arrays.deepEquals(arr2D1, arr2D2)); // true

        // 1️⃣3️⃣ toString()
        System.out.println("toString(): " + Arrays.toString(numbers)); // [1, 3, 4, 5, 9]

        // 1️⃣4️⃣ deepToString()
        System.out.println("deepToString(): " + Arrays.deepToString(arr2D1)); // [[1, 2], [3, 4]]

        // 1️⃣5️⃣ setAll()
        int[] squares = new int[5];
        Arrays.setAll(squares, i -> i * i);
        System.out.println("setAll(): " + Arrays.toString(squares)); // [0, 1, 4, 9, 16]

        // 1️⃣6️⃣ parallelSetAll()
        int[] cubes = new int[5];
        Arrays.parallelSetAll(cubes, i -> i * i * i);
        System.out.println("parallelSetAll(): " + Arrays.toString(cubes)); // [0, 1, 8, 27, 64]

        // 1️⃣7️⃣ stream()
        int sum = Arrays.stream(numbers).sum();
        System.out.println("stream().sum(): " + sum); // 22

        // 1️⃣8️⃣ spliterator()
        System.out.print("spliterator(): ");
        Arrays.spliterator(numbers).forEachRemaining(n -> System.out.print(n + " "));
        System.out.println();
    }
}

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📋 Summary Table — Array Methods with Descriptions